Fakhrudiyanto, N. 2017. Peran Unit Dikyasa Satuan Lalu Lintas Polres Purworejo dalam Menekan Angka Kecelakaan Lalu Lintas: The Role of Dikyasa Traffic Unit Police of Purworejo Regional Police in Suppressing Traffic Accident Rates. Advances in Police Science Research Journal. 1, 1 (Jan. 2017), 195-244.